7-hydroxy-8-[[4-(phenylazo)phenyl]azo]naphthalene-1,3,6-trisulphonic acid, compound with bis(cyclohexyl)amine C.I.27306 C.I.Solvent Red 31 Solvent Red 31 (8Z)-7-Oxo-8-({4-[(E)-phenyldiazenyl]phenyl}hydrazono)-7,8-dihydr o-1,3,6-naphthalenetrisulfonic acid - N-cyclohexylcyclohexanamine (1:1) Solvent Red 31 ISO 9001：2015 REACH C.I.Solvent Red 31:C.I.27306